65611389 has 24 divisors (see below), whose sum is σ = 94366080. Its totient is φ = 40525632.

The previous prime is 65611379. The next prime is 65611391. The reversal of 65611389 is 98311656.

It is not a de Polignac number, because 65611389 - 2⁹ = 65610877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65611349) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 50257 + ... + 51545.

It is an arithmetic number, because the mean of its divisors is an integer number (3931920).

Almost surely, 2^65611389 is an apocalyptic number.

It is an amenable number.

65611389 is a deficient number, since it is larger than the sum of its proper divisors (28754691).

65611389 is a wasteful number, since it uses less digits than its factorization.

65611389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1377 (or 1358 counting only the distinct ones).

The product of its digits is 38880, while the sum is 39.

The square root of 65611389 is about 8100.0857402870. The cubic root of 65611389 is about 403.3292733846.

The spelling of 65611389 in words is "sixty-five million, six hundred eleven thousand, three hundred eighty-nine".